Magnetic device with impact cushion



Dec. 9, 1969 B. A. PALM 3,482,689

MAGNETIC DEVICE WITH IMPACT CUSHION Filed Aug. 21, 1967 2 Sheets-Sheet 1 m N N FIG.|

INVENTOR. BERNHARD A. PALM ATTORNEYS Dec. 9, 1969 B. A. PALM MAGNETIC DEVICE WITHIMPACT CUSHION 2 Sheets-Sheet 2 Filed Aug. 21, 1967 l i i INVENTOR. BEFQNHARD A. PALM ATTORNEYS United States Patent 3,482,689 MAGNETIC DEVICE WITH IMPACT CUSHION Bernhard A. Palm, Los Angeles, Calif., assignor to Buck Manufacturing Company, Los Angeles, Calif., a corporation of Delaware Filed Aug. 21, 1967, Ser. No. 661,963 Int. Cl. B07c 5/34 US. Cl. 209-115 4 Claims ABSTRACT OF THE DISCLOSURE A suspension magnet provided with an impact cushion supported over the pole face of the central pole. The suspension magnet is supported with a conveyor moving over the impact cushion and central pole so that when magnetic material is attracted by the magnet field, the magnetic material hits the bottom side of the conveyor opposite the cushion. The cushion adsorbs the impact of the magnetic material and provides a soft backing to the conveyor so that wear on the conveyor is substantially reduced.

DESCRIPTION OF THE INVENTION This invention relates to suspension magnetic devices in general. More particularly, this invention relates to suspension magnetic device provided with an impact cushion between the pickup pole and conveyor.

An object of this invention is to provide an improved conveyor with wear-reducing means for suspension magnetic devices.

Another object of this invention is to provide a magnetic device and conveyor arrangement with cushion means interposed between a pole face of the magnetic device and the conveyor to reduce wear on the conveyor resulting from impact thereon of magnetic material attracted by the magnetic device.

Other and further objects of this invention will be apparent to those skilled in the art to which it relates from the following specification, claims and drawing in which, briefly:

FIG. 1 is a sectional view in side elevation of a suspension magnetic device and conveyor arrangement provided with an impact cushion between a pole face of the magnetic device and the conveyor; and

FIG. 2 is a bottom view of the magnet and conveyor arrangement with the conveyor partially broken away.

7 Referring to the drawing in detail, reference numeral 10 designates a magnetic device having a housing 11 of nonmagnetic material in which the magnet core structure 12 and winding 13 are positioned. The core structure is provided with a central pole member 14, outer pole members 15 and a top member 16 which is joined to the tops of the central pole member 14 and outer pole members 157 preferably by welding, although other fastening means may be used. The outer pole members 15 may be composite plate assemblies such as disclosed in my Patent No. 3,439,304, issued Apr. 15, 1969 for Suspension Lifting Magnet.

A suitable space is provided around the winding 13 and between the winding and core structure for receiving a quantity of cooling liquid such as oil. Suitable terminals, such as terminal 17 which are insulated from the housing and core structure, are provided for making electrical connections to the winding 13 from the outside of the housing 11. A suitable enclosure 18 is provided around the outside of the terminals. A source of electric power (not shown) is connected to the terminals for energizing the winding 13. A plate 19 of magnetic material is attached to the face of the central pole 14 and this plate is substantially longer than the diameter of the central pole and "ice provides better distribution of the magnetic field between it and the pole pieces 15 so that the magnetic field is spread more uniformly across the conveyor 20. The magnetic device is supported by a bracket or other means (not shown) so that the bottom of the housing 11 is adjacent a top surface of the conveyor. Conveyor 20 is supported by the pulleys 20a and the magnetic device 10 is positioned between the webs thereof.

The magnetic device 10 is provided with an impact cushion 21 which may be of rubber or the like and which is attached to the bottom of the housing 11 opposite the central pole plate 19. The impact cushion 21 is substantially larger than plate 19 so that it forms a soft, impact absorbing backing for the conveyor to take up the force of the magnetic objects attracted by the magnetic device.

A glide surface 22, which may be of material such as Teflon or the like, attached by suitable adhesive, cement or the like to the bottom of the impact cushion 21. This provides a wear-resistant glide surface for the conveyor to the bottom of the impact cushion. Guide plates 23 of nonmagnetic stainless steel or the like are attached to the bottom of the housing 11 by welding or the like. Plates 23 are positioned on opposite sides of the impact cushion 21. and provide inclined surfaces over which the conveyor 20 passes during the operation of this apparatus.

The conveyor 20 and magnetic device 10 may be supported by brackets or other supporting means (not shown) over a conventional main conveyor M carrying material from which it is desired to separate magnetic objects. In such instance, conveyor 20 may be supported a suitable distance above and across the main conveyor M carrying the material so that magnetic objects thereon are picked up by the magnetic device 10 and shifted off to the side of the main conveyor beyond the plate A by conveyor 20. During this operation the magnetic objects which may be of a rough and sharp nature roll on the bottom of the conveyor 20 as they are moved by this conveyor through the magnetic field of the device 10. In cases where conveyor 20 is not provided with an impact cushion such as the cushion 21, but rubs or moves on the under side of the magnetic device housing directly, the sharp magnetic objects rolling on the bottom side of the conveyor 20 damage the conveyor even after relatively short intervals of use. It has been found that by providing the impact cushion 21 and glide surface 22 to the magnetic device, this wear and damage to the conveyor 20 is reduced to a minimum and thus greatly prolongs the useful life thereof.

While I have shown a preferred embodiment of the invention, it will be understood that the invention is capable of variation and modification from the form sho n so that the scope thereof should be limited only by the p oper scope of the claims appended hereto.

What I claim is:

1. In a magnetic pickup device of the suspension type, the combination comprising a magnetic device having means producing a magnetic field through a predetermined air gap, means supporting said magnetic device, means conveying material including magnetic objects so that said material passes through said magnetic field. and said magnetic objects are caused to move toward a pole face of said magnetic device, an auxiliary conveying means moving through said magnetic field so that it intercepts said magnetic objects moving toward said pole face, and stationary cushion means positioned between said pole face and said auxiliary conveying means to reduce the wearing elfect of the impact of said magnetic articles on the bottom of said auxiliary conveying means.

2. In a magnetic pickup device of the suspension type, the combination as set forth in claim 1 further characterized in that said cushion means is provided with a surface of wear-resistant plastic over which said auxiliary conveying means is adapted to glide.

3. In a magnetic pickup device of the suspension type, the combination as set forth in claim 2 further comprising guide surfaces inclined to the forward and rearward sides of said cushion means to guide said auxiliary conveying means to and from said cushion means.

4. In a magnetic pickup device of the suspension type, the combination as set forth in claim 3 further characterized in that said inclined guide surfaces comprise plates of nonmagnetic material attached to said housing.

References Cited UNITED STATES PATENTS 3,042,205 7/ 1962 Merwin 209218 3,082,857 3/ 1963 Holloman 19857 FOREIGN PATENTS 926,067 3( 1961 Great Britain.

RICHARD E. AEGERTER, Primary Examiner 

